First-principles study of exchange interactions and Curie temperatures of half-metallic ferrimagnetic full Heusler alloys Mn2VZ (Z=Al, Ge)

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dc.creatorSasioglu, E.
dc.creatorSandratskii, L. M.
dc.creatorBruno, P.
dc.date2005-04-26
dc.date.accessioned2026-07-07T03:04:56Z
dc.date.available2026-07-07T03:04:56Z
dc.descriptionWe report the parameter-free, density functional theory calculations of interatomic exchange interactions and Curie temperatures of half-metallic ferrimagnetic full Heusler alloys Mn2VZ (Z=Al, Ge). To calculate the interatomic exchange interactions we employ the frozen-magnon approach. The Curie temperatures are calculated within the mean-field approximation to the classical Heisenberg Hamiltonian by solving a matrix equation for a multi-sublattice system. Our calculations show that, although a large magnetic moment is carried by Mn atoms, competing ferromagnetic (inter sublattice) and antiferromagnetic (intra sublattice) Mn-Mn interactions in Mn2VAl almost cancel each other in the mean-field experienced by the Mn atoms. In Mn2VGe the leading Mn-Mn exchange interaction is antiferromagnetic. In both compounds the ferromagnetism of the Mn subsystem is favored by strong antiferromagnetic Mn-V interactions. The obtained value of the Curie temperature of Mn2VAl is in good agrement with experiment. For Mn2VGe there is no experimental information available and our calculation is a prediction.
dc.description7 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0504679
dc.identifierhttp://arxiv.org/abs/cond-mat/0504679
dc.identifierJ. Phys.: Cond. Matt. 17, 995 (2005)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26273
dc.subjectMaterials Science
dc.titleFirst-principles study of exchange interactions and Curie temperatures of half-metallic ferrimagnetic full Heusler alloys Mn2VZ (Z=Al, Ge)
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